package collection.stream;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.stream.Collectors;

public class StreamApiDemo {
    public static void main(String[] args) {
        Random rand=new Random();
        List<Integer>list=new ArrayList<>();
        for (int i=0;i<10;i++){
            list.add(rand.nextInt(10));
        }
        System.out.println(list);
        List<Integer>list2=list.stream().map(e->e*3).collect(Collectors.toList());
        System.out.println(list2);
        List<Integer> list3 = list.stream().filter(e->e%2==0).collect(Collectors.toList());
        System.out.println(list3);
        List<Integer> list4 = list.stream().distinct().collect(Collectors.toList());
        System.out.println(list4);
        List<Integer> list5 = list.stream().sorted((e1,e2)->e2-e1).collect(Collectors.toList());
        System.out.println(list5);

        //对集合每个元素扩大3倍并获取其中所有的偶数然后去除集合重复元素并降序排列
        List<Integer> list6 = list.stream()
                .map(e->e*3)
                .filter(e->e%2==0)
                .distinct()
                .sorted((e1,e2)->e2-e1)
                .collect(Collectors.toList());
        System.out.println(list6);


    }
}
